"Clocking" is shop talk for part orientation. For example, a cylindrical symmetrical part with a slot in it may need to be "clocked" (oriented) relative to that slot. The slot will become a possible secondary datum feature for orientation purposes.
Yes for the keyway; a spline is a considered a complex "pattern" and may or may not be called out to orient a part. But your keyway example is a good one!
No, not really. The bore of this thing should be the secondary datum feature (establishing a datum axis). The tertiary datum (for "Clocking") should be the slot between the two larger tabs. Datums are developed from physical features that have mating relationships in an assembly.
No, not really. The bore of this thing should be the secondary datum feature (establishing a datum axis). The tertiary datum (for "Clocking") should be the slot between the two larger tabs. Datums are developed from physical features that have mating relationships in an assembly.
Why would the bore need to be involved. Datum -B- is the minor diameter of the spline. This establishes a datum axis. The center of the slot between the two larger tabs is the tertiary positioning reference. If the radius was manufactured in the wrong place, more than one of the dimensions relating to it would be out of tolerance. I'm still not sure the print doesn't contain enough information.
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